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Finding the Third Proportional to 618 and 1,357

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Solution

The third proportional to 618 and 1,357 is: 2,979.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    618 : 1,357 = 1,357 : x
  2. Step 2: Convert to fraction form
    618/1,357 = 1,357/x
  3. Step 3: Cross multiply
    618x = 1,357 × 1,357
  4. Step 4: Simplify right side
    618x = 1,841,449
  5. Step 5: Solve for x
    x = 1,841,449/618
  6. Step 6: Final answer
    x = 2,979.69

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.